DOUBLE HOOK TO FASTEN CROSSED BARS

Abstract: The double hook is a clip studied for being used in building above all to fasten longitudinal iron bars to the reinforcement stirrups. This clip, consisting of two elastic hooks (A) and two fixed seats arranged crosswise, can be opened exerting a light pressure with fingers and placed in the crossing-point of two adequate bars; when the clip is loose its hooks closing again on the same bar push it against the other one blocked by the proper seats, thus creating the desired bond.

Description: "DOUBLE HOOK TO FASTEN CROSSED BARS" Description The invention relates to a clip permitting to fix cros¬ sed bars, even coupled ones. Such clip consists of two distinct and identical hooks of new shape for fastening a bar, that join together on the top in crossed direction to the hooks in order to form the jaws and the seats of the bar. Once the hooks are opened, exerting a pressure on the jaws, the clip can be placed on the crossing-point of the two bars and then when they are loose they close again pushing the bar on the crossed one which is blocked by the proper seats. Such clip may be usefully employed in reinforced-concre- te building as it permits quickly and safely a bond between the longitudinal iron bars and the stirrups. At present the binding of longitudinal bars to the rein¬ forcement stirrups takes place by the use of iron wire and such, by welding and, not very often, by some kind of hooks. The welding process requires complex equipment which is difficult to use in building site, and the hooks are not very practical; both methods need skilled labour. The iron wire permits to bind, in order to cut down on costs and time, two or more concurrent bars to the detri¬ ment of the "air-gaps" required by rules. All this caused, especially in the past, continuos disagreements between the building management and the executor contractors. In this area there is another little-observed rule: the abutemeήt stone. Such abutment stone and air-gap are required by the regulations in order to make the execu- 1 SUBSTITUTE SHEET ted work correspond with the projected one and to en- sure its endurance. Many years ago, the technologic development put on the market a special distance piece 06for the abutment sto¬ ne but it is not very used for its cost and for the long time of exposure, so still nowadays we rely on the will and skill of those employed on casting. In order to make easier the work of the fitter of rein¬ forced concrete bars and to fasten the stirrups to the longitudinal bar in a quickly and safetely way (this bond can be removed); in order to reduce the time of ex- posure and costs and in the meanwhile ensuring the com¬ pliance with the regulations about the abutment stone and air-gap, this study carried out by Ing. Dragone with the cooperation of his son Ing. Antonio Dragone, has lead to the realization of a practical clip called "double hook" provided with a new form of seats for bars in one direction and with hooks that can be elastically opened in the crossed direction and, as already said, when they close they fasten the crossed bars in observance of the law about the abutment stone and air-gap. The double hook is formed as showed by figure n.l of the attached drawing, of a double couple of opposing and integral semihook (A), in their median part (C), fulcrum of the double lever joined lOtogether by the bodies (B), orthogonal and oblique to the previous one forming the housings of the transverse bar and the opposing takings to control the double lever. Infact, bringing the two bodies near, the semi-hooks se¬ parate from each other, in short: the double hook opens, figure 3, and it can be easily placed being careful to 2 SUBSTITUTE SHEET include in the middle the transversal bar, the diameter of which has to exceed the distance between the intra- dosses of the two seats and those of the relative hooks. Loosing the bodies they separate from each other and consequently 12the semi-hooks draw near, in short: the dou- ble hook closes, figure 2, fixing together the two bars either for the shape or for the elastic distorsion of the initial forms. The bars have to be inferior to the geometrical ones that are necessary to the fastening of the two bars. The above mentioned double hook can be realized with a- ny kind of elastic compatible material with the bars to be fixed and with their relative use, as its shape, as in the attached drawing for round bars has to be considered indicative. Particularly, the double hook for its simple positio¬ ning and removal, can be employed to fasten, before the casting, the longitudinal stirrups and irons, for¬ ming the reinforcement of the concrete. This operation, at present, is carried out by the use of the iron wire; this because the hooks that are on sale are not practical. This 15new kind of hook will have success for its simple positioning and removal; you have only to exert a light pressure in order to open and place it, and also for the double sym- metric form of the hook and of the elastic reactions as to the punctiform contact of the two bars where these latter form the stable fixing force, that can be ensured by a simple hook realized with only a half of this one. It has to be stated that a clip realized with only one 3 SUBSTITUTE SHEET hook and a lateral fixed seat,even if this latter is ma de with another hook, is theoretically able to fasten crossed bars but its stability is labile. On the contrary,the link has to be resistant to the stro_ kes and the vibrations of the casting,and this resis an- ce can be ensured by the clip "double hook". This clip, having the contact point of the bars inside a double system of symmetric bonds, presents several balance plans that ensures the resistance to the strokes and the vibrations of the casting. The clip will be provided of a safety-locking for the accidental strokes and unwanted reopening. Furthermore, the double symmetric form makes its usa¬ ge more quick and easier even for inexepert persons. - 4 - SUBSTITUTE SHEET

Claims: Claims 1) All the clips, provided with simple of double couple of jaws, of symmetric or asymmetric form, using, even in a pa¬ rtial way the innovation of two seats and two hooks place- d crosswise and joined together so that they can be mana¬ ged simultaneously with fingers and capabJe of fasten the crossed bars either single or coupled ones. 2) All the clips as indicated by the previous point 1), but realized with two seats and two hooks. 3) All the clips as indicated by the previous point 1), but provided with a seat and two hooks . 4) All the clips as indicated by the previous point 1), but provided with several seats and hooks. 5) All the clips as indicated by the previous point 1), but provided with one or more hooks in a direction and one or more hooks in the crossed direction. 6) All the clips to fasten longitudinal bars to the rein¬ forcement stirrups based on the innovation as for the po¬ ints 1,2,3,4 and 5 and having the jaws, above called bo¬ dies (B), acting as distance piece for the abutment stone. 7) All the clips realized according to the previous poin¬ ts 1,2,3,4,5 and 6 and having lateral extensions acting as distance piece for the abutment stone. - 5 - SUBSTITUTE SHEET

Inventors: DRAGONE MARIO, DRAGONE, MARIO
Applicants: DRAGONE MARIO, DRAGONE, MARIO
Application year: 1994
Main classification: E04C5
IPC codes: E04C5